<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>三行表格</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        html,body,table{
            width: 100%;
            height: 100%;
        }
       tr{
           height: 100px;
           background: orangered;
       }
       tr:nth-child(2){
           height: 100%;
           background: orange;
       }
    </style>
</head>
<body>
    <table border="0" cellspacing="0" cellspadding="0">
        <tr>
            <td>top</td>
        </tr>
        <tr>
            <td>middle</td>
        </tr>
        <tr>
            <td>bottom</td>
        </tr>
    </table>
</body>
</html>